CN101581699A - Pulse eddy nondestructive testing method based on time gate - Google Patents
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Abstract
The invention discloses a pulse eddy nondestructive testing method based on a time gate, which is characterized in that an array eddy sensor is closely attached to an array area on the surface of a component for scanning and testing; any waveform generators respectively apply a prearranged pulse excitation signal with a certain frequency to the excitation windings of the eddy sensor at each array point position; the eddy sensing signals generated by the pulse excitation signal in the component are respectively picked up by the test windings of the eddy sensor at each array point position; the time gate way is used for extracting the amplitude data of the eddy sensing signals of the eddy sensor at each array point position; and the scanning area of the imaged tested component can intuitively display the defect state of the tested component by calculating the relative amplitude of the eddy sensing signals of the eddy sensor at array point position in the array area and carrying out gray treatment on the relative amplitude. The method has the advantages of convenient testing, easy realization and accurate testing results.
Description
Technical field
The present invention relates to a kind of lossless detection method, particularly relate to a kind of pulse eddy nondestructive testing method based on time gate.
Background technology
Non-Destructive Testing NDT (nondestructive test) implements a kind of detection means of not damaging or not influencing its following usability or purposes to material or workpiece, by using NDT, can find the inner and surperficial existing defective of material or workpiece, the geometric properties of energy measurement workpiece and size can be measured inside composition, structure, physical property and the state etc. of material or workpiece.Dynamic Non-Destruction Measurement now has been widely used in each industrial circle, in manufacturing industry, space flight and aviation, field of petrochemical industry.Existing conventional lossless detection method mainly includes that radiographic inspection (RT) method, Ultrasonic Detection (UT) method, infiltration are detected (PT) method, magnetic detects (MT) method, EDDY CURRENT (ET) method etc., and unconventional lossless detection method then includes microwave detection method, current potential detection method etc.
EDDY CURRENT as one of conventional sense method is the approaching coil that is connected with alternating current of conductor, sets up alternating magnetic field by coil, and this alternating magnetic field passes through conductor, and the electromagnetic induction effect takes place with it, sets up eddy current in conductor; Eddy current in the conductor also can produce the magnetic field of oneself, and the effect of eddy current magnetism has changed the power in former magnetic field, and then causes the change of coil voltage and impedance; When defective appears in conductive surface or nearly surface, will have influence on the intensity and the distribution of eddy current, the variation of eddy current has caused the variation of magnetic test coil voltage and impedance again, this variation of root a tree name just can be known the existence of the interior defective of conductor indirectly.
In EDDY CURRENT, the signal that member will detect is the variation from the impedance of magnetic test coil or secondary coil induced voltage, because it is a lot of to influence the factor of impedance and voltage, the influence degree difference of each factor, therefore to from this many factor, extract significant detection signal, must handle accordingly signal, to reach the purpose of eliminating undesired signal.In the eddy current detection method of prior art, mainly adopted the impedance analysis method that signal is handled, the impedance analysis method is to cause the variation of coil impedance and the substantial connection between the phase change thereof to analyze eddy effect, thereby differentiates a kind of analytical approach of each influence factor effect.Angle from electromagnetic wave propagation, the sort signal disposal route comes down to distinguish uncontinuity in the member according to the principle that signal has out of phase to postpone, because in the electromagnetic wave propagation process, phase delay is to enter the different depth in the conductor with electromagnetic signal and required time of turning back back and forth links together.Adopt the impedance analysis method just can obtain impedance plane diagram, utilize impedance plane diagram just can analyze the defective of member, one of staple of impedance diagram is a phase place.Because coil impedance changes the concentrated expression of the influence that is the various parameters of member, therefore in the existing EDDY CURRENT, just need to adopt modes such as phase sensitive detection, filtering to eliminate undesired signal, take out needed flaw indication.EDDY CURRENT also can adopt such as other modes such as spectrum analyses the signal that extracts is handled, spectrum analysis is that the signal intensity that signal source is sent is launched by frequency order, make its function that becomes frequency, and investigate Changing Pattern, carry out defect analysis.No matter be to adopt the impedance analysis method to extract Signal Processing, still adopt Spectral Analysis Method to extract Signal Processing, existing eddy current detection method all can not demonstrate the situation of member defective (as crackle) intuitively.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of pulse eddy nondestructive testing method based on time gate is provided, can demonstrate the defect state of tested member intuitively, have easy to detect, easy realization, detect the effect characteristic of accurate.
The technical solution adopted for the present invention to solve the technical problems is: a kind of pulse eddy nondestructive testing method based on time gate comprises the steps:
A. an array region the array eddy current sensor being pressed close to component surface scans detection, each array point position in array region applies a pulse excitation signal with certain frequency that presets to the excitation winding of the eddy current sensor of each array point position respectively by AWG (Arbitrary Waveform Generator);
B. the detection winding corresponding to the eddy current sensor of each array point position in the array region of member picks up the vortex induction signal that excitation winding is separately produced in this array point position of member by described pulse excitation signal excitation back respectively;
C. described vortex induction signal is sent into computer processing system by mould/number interface after preposition amplification;
D. in computer processing system, it is the relation curve to there being amplitude to change of transverse axis that the vortex induction signal of the eddy current sensor of described each array point position was processed into respectively with time;
E. in computer processing system, to have the time point in the identical time interval with respect to the timeorigin that applies pumping signal, from described each relation curve, extract amplitude data respectively corresponding to the vortex induction signal of the eddy current sensor of each array point position in the array region;
F. in computer processing system, calculate the relative Amplitude Value Data of eddy current sensor in array of each array point position in the array region respectively, and the pairing relative Amplitude Value Data of the eddy current sensor of each array point position is processed into corresponding gradation data according to the gray scale processing mode;
G. computer processing system carries out imaging processing according to the eddy current sensor corresponding gray scale data of each array point position in the array region, and the imaging processing signal is exported to display;
H. display demonstrate each array point position in the array region eddy current sensor in member the gray level image of corresponding scanning area.
Described array eddy current sensor is lined up the face battle array by a plurality of eddy current sensors and is constituted, and a plurality of eddy current sensors of lining up the face battle array are covered in each array point position of the array region of described member respectively; The timesharing that is actuated to that each eddy current sensor applies in the battle array of described AWG (Arbitrary Waveform Generator) opposite encourages or encourages in real time.
Described array eddy current sensor is lined up linear array by a plurality of eddy current sensors and is constituted, and a plurality of eddy current sensors of lining up linear array move along a direction and are covered in each array point position of the array region of described member; Described AWG (Arbitrary Waveform Generator) encourages or encourages in real time the timesharing that is actuated to that each eddy current sensor in the linear array applies.
Described array eddy current sensor is lined up dot matrix by single eddy current sensor and is constituted, and an eddy current sensor that constitutes dot matrix moves and is covered in each array point position of the array region of described member along perpendicular X, Y both direction.
Described pulse excitation signal is a square-wave signal.
Described pulse excitation signal is a triangular signal.
Described pulse excitation signal is a sawtooth signal.
The described pulse excitation signal with certain frequency that presets is variable-frequency pulse excitation signal.
Described real-time excitation is to carry out under the state of magnetic shielding each other at each eddy current sensor.
A kind of pulse eddy nondestructive testing method of the present invention based on time gate, the frequency of pulse excitation signal can change, usually the length of penetration of the eddy current of metal surface induction is different with frequency, and the metal surface vortex density was big when excitation frequency was high, along with the reduction of excitation frequency, the eddy current length of penetration increases, but surface eddy density descends, therefore, and can be by changing excitation frequency, overcome the influence of skin effect to a certain extent, obtain the vortex induction signal of different depth.
A kind of pulse eddy nondestructive testing method of the present invention based on time gate, time gate is adjustable, promptly having the time point in the identical time interval with respect to the timeorigin that applies pumping signal can select.
A kind of pulse eddy nondestructive testing method based on time gate of the present invention can adopt the timesharing excitation to each eddy current sensor that is scattered in a burst of row of linear array or face, also can adopt real-time excitation.When adopting the timesharing excitation, the excitation winding of each eddy current sensor feeds identical pulse excitation signal successively, and pick up the vortex induction signal that excitation winding is separately produced by described pulse excitation signal excitation back respectively in member by the detection winding of each eddy current sensor, can not produce interference between each eddy current sensor.When adopting excitation in real time, for issuable interference, can adopt the method for magnetic shielding to be solved, such as, the case that magnetic shielding material is made is contained in the periphery of eddy current sensor respectively, and so that each eddy current sensor in the array is kept apart mutually, the opening of case is towards tested member, like this, the magnetic field that produced of the excitation winding of each each eddy current sensor just can not the phase mutual interference.
A kind of pulse eddy nondestructive testing method of the present invention based on time gate, a plurality of eddy current sensors are lined up array, during work, the method that adopts electronics is according to the logical program of setting, the array element timesharing is switched, or encourage in real time under the state of magnetic shielding each other at each eddy current sensor, and the vortex induction signal that each unit obtains exported to computer processing system, thereby finish the touring detection of an array, the one-time detection process of the eddy current sensor of array distribution is equivalent to traditional single eddy current sensor member is examined the testing process that comes and goes step-scan repeatedly of face, and the eddy current sensor of array distribution has great advantage for large-area EDDY CURRENT.
The invention has the beneficial effects as follows, owing to adopted the array region that the array eddy current sensor is pressed close to component surface to scan detection, and apply a pulse excitation signal that presets to the excitation winding of the eddy current sensor of each array point position respectively with certain frequency by AWG (Arbitrary Waveform Generator), the vortex induction signal that this pulse excitation signal is produced in member is picked up respectively by the detection winding of the eddy current sensor of each array point position, utilize the time gate mode to extract the amplitude data of the vortex induction signal of each array point position eddy current sensor, pass through the relative amplitude of the vortex induction signal of the eddy current sensor of array point position in the computing array zone again, and relative amplitude carried out after gray scale handles, make the scanning area of the tested member after the imaging can demonstrate the defect state of tested member intuitively, have easy to detect, easily realize, detect effect advantage accurately.
Below in conjunction with embodiment the present invention is described in further detail; But a kind of pulse eddy nondestructive testing method based on time gate of the present invention is not limited to embodiment.
Embodiment
Embodiment one, and a kind of pulse eddy nondestructive testing method based on time gate of the present invention comprises the steps:
A. an array region the array eddy current sensor being pressed close to component surface scans detection, each array point position in array region applies a pulse excitation signal with certain frequency that presets to the excitation winding of the eddy current sensor of each array point position respectively by AWG (Arbitrary Waveform Generator);
The array eddy current sensor is lined up the face battle array by a plurality of eddy current sensors and is constituted, and a plurality of eddy current sensors of lining up the face battle array are covered in each array point position of the array region of described member respectively; The timesharing that is actuated to that each eddy current sensor applies in the battle array of described AWG (Arbitrary Waveform Generator) opposite encourages or encourages in real time;
When adopting the timesharing excitation, the excitation winding of each eddy current sensor feeds identical pulse excitation signal successively, can not produce interference between each eddy current sensor; When adopting excitation in real time, for issuable interference, can adopt the method for magnetic shielding to be solved, such as, the case that magnetic shielding material is made is contained in the periphery of eddy current sensor respectively, and so that each eddy current sensor in the array is kept apart mutually, the opening of case is towards tested member, like this, the magnetic field that produced of the excitation winding of each each eddy current sensor just can the phase mutual interference;
This pulse excitation signal can adopt square-wave signal, also can adopt triangular signal, or adopts sawtooth signal;
B. the excitation winding that picks up respectively separately corresponding to the detection winding of the eddy current sensor of each array point position in the array region of member is subjected to described pulse excitation signal excitation back this vortex induction signal that position produced at member; The excitation winding of each eddy current sensor is encouraged by the pulse excitation signal of same frequency, same waveform as;
C. described vortex induction signal is sent into computer processing system by mould/number interface after preposition amplification; The vortex induction signal that the detection winding of each eddy current sensor is picked up is sent into computer processing system by mould/number interface respectively after preposition amplification, carry out analyzing and processing by computer processing system;
D. in computer processing system, it is the relation curve to there being amplitude to change of transverse axis that the vortex induction signal of the eddy current sensor of described each array point position was processed into respectively with time; That is, each eddy current sensor all has the relation curve of a correspondence, and this relation curve is expressed the time dependent situation of amplitude of vortex induction signal; Since be that the array eddy current sensor that employing face battle array is arranged comes corresponding to each the array point position in the array region of member, therefore, when the vortex induction signal that the detection winding picked up of each eddy current sensor is grade; In other words, do not have at member under the situation of defective, it is identical that the vortex induction signal that the detection winding of each eddy current sensor is picked up is located its amplitude in the identical time interval;
E. in computer processing system, to have the time point in the identical time interval with respect to the timeorigin that applies pumping signal, from described each relation curve, extract amplitude data respectively corresponding to the vortex induction signal of the eddy current sensor of each array point position in the array region; That is, adopt the time gate mode,, extract the amplitude data of vortex induction signal at point at the same time;
F. in computer processing system, calculate the relative Amplitude Value Data of eddy current sensor in array of each array point position in the array region respectively, and the pairing relative Amplitude Value Data of the eddy current sensor of each array point position is processed into corresponding gradation data according to the gray scale processing mode;
G. computer processing system carries out imaging processing according to the eddy current sensor corresponding gray scale data of each array point position in the array region, and the imaging processing signal is exported to display;
H. display demonstrate each array point position in the array region eddy current sensor in member the gray level image of corresponding scanning area.
In above-mentioned testing process, when member does not have defective, amplitude at the vortex induction signal of putting each eddy current sensor at the same time is identical, therefore, the relative Amplitude Value Data of each eddy current sensor is zero in the array, the gray scale of the pairing cell position of each eddy current sensor is 0% in the array, and therefore, the image that display does not just have such as crackle yet occurs.When member has defective such as crackle, the vortex induction signal that several eddy current sensor picked up in cracks or close cracks position, be processed into time be transverse axis when the relation curve that amplitude changes should be arranged, just with array in the relation curve of other eddy current sensor inconsistent, in the amplitude of its vortex induction signal of some place at the same time is can be not identical, therefore, the relative Amplitude Value Data of each eddy current sensor just can not be zero in the array, each eddy current sensor all can have a relative amplitude with respect to other eddy current sensor in the array, the absolute value of all relative amplitudes of each eddy current sensor is added up, like this, relative Amplitude Value Data at the eddy current sensor of cracks is just bigger, the relative Amplitude Value Data of the eddy current sensor of close cracks is just littler, the relative Amplitude Value Data of other eddy current sensor is just littler and identical, after these relative Amplitude Value Datas being carried out the gray scale processing, just can demonstrate on the display array eddy current sensor in member the gray level image of corresponding scanning area, and can clearly find out the position and the size of crackle.
Wherein, the pulse excitation signal with certain frequency that presets is variable-frequency pulse excitation signal; The frequency that is pulse excitation signal can change, usually the length of penetration of the eddy current of metal surface induction is different with frequency, the metal surface vortex density was big when excitation frequency was high, along with the reduction of excitation frequency, the eddy current length of penetration increases, but surface eddy density descends, therefore, can overcome the influence of skin effect to a certain extent by changing excitation frequency, obtain the vortex induction signal of different depth.
A kind of pulse eddy nondestructive testing method of the present invention based on time gate, time gate is adjustable, promptly having the time point in the identical time interval with respect to the timeorigin that applies pumping signal can select.
A kind of pulse eddy nondestructive testing method of the present invention based on time gate, a plurality of eddy current sensors are lined up array, during work, the method that adopts electronics is according to the logical program of setting, the array element timesharing is switched, and the vortex induction signal that each unit obtains exported to computer processing system, thereby finish the touring detection of an array, the one-time detection process of the eddy current sensor of array distribution is equivalent to traditional single eddy current sensor member is examined the testing process that comes and goes step-scan repeatedly of face, and the eddy current sensor of array distribution has great advantage for large-area EDDY CURRENT.
Embodiment two, and a kind of pulse eddy nondestructive testing method based on time gate of the present invention comprises the steps:
A. an array region the array eddy current sensor being pressed close to component surface scans detection, each array point position in array region applies a pulse excitation signal with certain frequency that presets to the excitation winding of the eddy current sensor of each array point position respectively by AWG (Arbitrary Waveform Generator);
The array eddy current sensor is lined up linear array by a plurality of eddy current sensors and is constituted, and a plurality of sensors of lining up linear array move along a direction and are covered in each array point position of the array region of described member; Described AWG (Arbitrary Waveform Generator) encourages or encourages in real time the timesharing that is actuated to that each eddy current sensor in the linear array applies;
When adopting the timesharing excitation, the excitation winding of each eddy current sensor feeds identical pulse excitation signal successively, can not produce interference between each eddy current sensor; When adopting excitation in real time, for issuable interference, can adopt the method for magnetic shielding to be solved, such as, the case that magnetic shielding material is made is contained in the periphery of eddy current sensor respectively, and so that each eddy current sensor in the array is kept apart mutually, the opening of case is towards tested member, like this, the magnetic field that produced of the excitation winding of each each eddy current sensor just can the phase mutual interference;
This pulse excitation signal can adopt square-wave signal, also can adopt triangular signal, or adopts sawtooth signal;
B. the excitation winding that picks up respectively separately corresponding to the detection winding of the eddy current sensor of each array point position in the array region of member is subjected to described pulse excitation signal excitation back this vortex induction signal that position produced at member;
C. described vortex induction signal is sent into computer processing system by mould/number interface after preposition amplification; The vortex induction signal that the detection winding of the eddy current sensor of each array point position is picked up in the array region of member is sent into computer processing system by mould/number interface respectively after preposition amplification, carry out analyzing and processing by computer processing system;
D. in computer processing system, it is the relation curve to there being amplitude to change of transverse axis that the vortex induction signal of described each eddy current sensor was processed into respectively with time; The array region of member is moved along a direction by a plurality of sensors of lining up linear array and forms, that is, each eddy current sensor all has the relation curve of a correspondence, and this relation curve is expressed the time dependent situation of amplitude of vortex induction signal; Owing to be real-time excitation, and pumping signal is same, and therefore, the vortex induction signal that the detection winding of each eddy current sensor is picked up is corresponding at identical time point; In other words, do not have at member under the situation of defective, the vortex induction signal that the detection winding of each eddy current sensor is picked up is identical in its amplitude of identical time point;
In computer processing system, it is the relation curve to there being amplitude to change of transverse axis that the vortex induction signal of the eddy current sensor of described each array point position was processed into respectively with time; That is, each location point all has the relation curve of a correspondence, and this relation curve is expressed the time dependent situation of amplitude of the vortex induction signal of this position; The array region of member is moved along a direction by a plurality of sensors of lining up linear array and forms, though, for eddy current sensor, in moving process, vortex induction signal corresponding to each point is an anisochrouous, still, and can be by the processing of computer system, be translated at each location point place, when being grade corresponding to pumping signal; In other words, do not have at member under the situation of defective, it is identical that the vortex induction signal of each location point is located its amplitude in the identical time interval;
E. in computer processing system,, from described relation curve, extract the amplitude data of the vortex induction signal of each position point unit vortex flow sensor respectively to have the time point in the identical time interval with respect to the timeorigin that applies pumping signal; That is, adopt the time gate mode,, extract the amplitude data of vortex induction signal at point at the same time (being the identical time interval promptly) comparatively speaking corresponding to timeorigin;
F. in computer processing system, calculate the relative Amplitude Value Data of location point eddy current sensor in array in the array region respectively, and the pairing relative Amplitude Value Data of each position point unit vortex flow sensor is processed into corresponding gradation data according to the gray scale processing mode;
G. computer processing system carries out imaging processing according to each position point unit vortex flow sensor corresponding gray scale data, and the imaging processing signal is exported to display;
H. display demonstrate each location point in the array region eddy current sensor in member the gray level image of corresponding scanning area.
In above-mentioned testing process, when member does not have defective, the amplitude of the vortex induction signal of the eddy current sensor of each location point is identical in the zone of lattice array at the same time comparatively speaking, therefore, the relative Amplitude Value Data of the eddy current sensor of each location point is zero in the array, the gray scale of the pairing cell position of eddy current sensor of each location point is 0% in the array, and therefore, the image that display does not just have such as crackle yet occurs.When member has defective such as crackle, the vortex induction signal that several eddy current sensor picked up at cracks or close cracks location point, be processed into time be transverse axis when the relation curve that amplitude changes should be arranged, just with array in the relation curve of eddy current sensor of other location point inconsistent, amplitude at comparatively speaking its vortex induction signal of the place of point at the same time is can be not identical, therefore, the relative Amplitude Value Data of the eddy current sensor of each location point just can not be zero in the array, the eddy current sensor of each location point all can have a relative amplitude with respect to the eddy current sensor of other location point in the array, the absolute value of all relative amplitudes of the eddy current sensor of each location point is added up, like this, relative Amplitude Value Data at the eddy current sensor of cracks location point is just bigger, the relative Amplitude Value Data of the eddy current sensor of close cracks location point is just littler, the relative Amplitude Value Data of the eddy current sensor of other location point is just littler and identical, after these relative Amplitude Value Datas being carried out the gray scale processing, just can demonstrate on the display array eddy current sensor in member the gray level image of corresponding scanning area, and can clearly find out the position and the size of crackle.
Wherein, the pulse excitation signal with certain frequency that presets is variable-frequency pulse excitation signal.
Embodiment three, a kind of pulse eddy nondestructive testing method of the present invention based on time gate, be with the difference of embodiment two, described array eddy current sensor is lined up dot matrix by single eddy current sensor and is constituted, and a sensor that constitutes dot matrix moves and is covered in each array point position of the array region of described member along perpendicular X, Y both direction.
The foregoing description only is used for further specifying a kind of pulse eddy nondestructive testing method based on time gate of the present invention; but the present invention is not limited to embodiment; every foundation technical spirit of the present invention all falls in the protection domain of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (9)
1. the pulse eddy nondestructive testing method based on time gate is characterized in that: comprise the steps:
A. an array region the array eddy current sensor being pressed close to component surface scans detection, each array point position in array region applies a pulse excitation signal with certain frequency that presets to the excitation winding of the eddy current sensor of each array point position respectively by AWG (Arbitrary Waveform Generator);
B. the detection winding corresponding to the eddy current sensor of each array point position in the array region of member picks up the vortex induction signal that excitation winding is separately produced in this array point position of member by described pulse excitation signal excitation back respectively;
C. described vortex induction signal is sent into computer processing system by mould/number interface after preposition amplification;
D. in computer processing system, it is the relation curve to there being amplitude to change of transverse axis that the vortex induction signal of the eddy current sensor of described each array point position was processed into respectively with time;
E. in computer processing system, to have the time point in the identical time interval with respect to the timeorigin that applies pumping signal, from described each relation curve, extract amplitude data respectively corresponding to the vortex induction signal of the eddy current sensor of each array point position in the array region;
F. in computer processing system, calculate the relative Amplitude Value Data of eddy current sensor in array of each array point position in the array region respectively, and the pairing relative Amplitude Value Data of the eddy current sensor of each array point position is processed into corresponding gradation data according to the gray scale processing mode;
G. computer processing system carries out imaging processing according to the eddy current sensor corresponding gray scale data of each array point position in the array region, and the imaging processing signal is exported to display;
H. display demonstrate each array point position in the array region eddy current sensor in member the gray level image of corresponding scanning area.
2. a kind of pulse eddy nondestructive testing method according to claim 1 based on time gate, it is characterized in that: described array eddy current sensor is lined up the face battle array by a plurality of eddy current sensors and is constituted, and a plurality of eddy current sensors of lining up the face battle array are covered in each array point position of the array region of described member respectively; The timesharing that is actuated to that each eddy current sensor applies in the battle array of described AWG (Arbitrary Waveform Generator) opposite encourages or encourages in real time.
3. a kind of pulse eddy nondestructive testing method according to claim 1 based on time gate, it is characterized in that: described array eddy current sensor is lined up linear array by a plurality of eddy current sensors and is constituted, and a plurality of sensors of lining up linear array move along a direction and are covered in each array point position of the array region of described member; Described AWG (Arbitrary Waveform Generator) encourages or encourages in real time the timesharing that is actuated to that each eddy current sensor in the linear array applies.
4. a kind of pulse eddy nondestructive testing method according to claim 1 based on time gate, it is characterized in that: described array eddy current sensor is lined up dot matrix by single eddy current sensor and is constituted, and a sensor that constitutes dot matrix moves and is covered in each array point position of the array region of described member along perpendicular X, Y both direction.
5. a kind of pulse eddy nondestructive testing method based on time gate according to claim 1 is characterized in that: described pulse excitation signal is a square-wave signal.
6. a kind of pulse eddy nondestructive testing method based on time gate according to claim 1 is characterized in that: described pulse excitation signal is a triangular signal.
7. a kind of pulse eddy nondestructive testing method based on time gate according to claim 1 is characterized in that: described pulse excitation signal is a sawtooth signal.
8. a kind of pulse eddy nondestructive testing method based on time gate according to claim 1 is characterized in that: the described pulse excitation signal with certain frequency that presets is variable-frequency pulse excitation signal.
9. according to claim 2 or 3 described a kind of pulse eddy nondestructive testing methods based on time gate, it is characterized in that: described real-time excitation is to carry out under the state of magnetic shielding each other at each eddy current sensor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192953A (en) * | 2010-08-30 | 2011-09-21 | 中机生产力促进中心 | Low-power consumption intelligent three-dimensional magnetic leakage detecting probe |
| CN109655524A (en) * | 2019-01-29 | 2019-04-19 | 爱德森（厦门）电子有限公司 | A kind of detection method of dissimilar metal riveting crizzle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6037768A (en) * | 1997-04-02 | 2000-03-14 | Iowa State University Research Foundation, Inc. | Pulsed eddy current inspections and the calibration and display of inspection results |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192953A (en) * | 2010-08-30 | 2011-09-21 | 中机生产力促进中心 | Low-power consumption intelligent three-dimensional magnetic leakage detecting probe |
| CN109655524A (en) * | 2019-01-29 | 2019-04-19 | 爱德森（厦门）电子有限公司 | A kind of detection method of dissimilar metal riveting crizzle |
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